Hot dip galvanizing is the form of galvanization where steel and iron are coated with zinc. The zinc alloys with base of metal. This technique of galvanisation is highly practiced as it provides improvement of life and durable nature of steel.

It is highly beneficial if the products are to be used in corrosive environments. Hot-dip galvanizing dramatically improves the longevity and durability of steel. This is especially important in highly corrosive environments. Hot Galvanizing plants are dedicated to practicing this process.

At times, it happens that the natural weather conditions are as such which supports corrosion. At this point of time, it is quite important to protect against corrosion.  The hot dip galvanising services are quite essential for Crash barriers, Cable trays and earthing materials.

Metal Crash Barriers also called Highway Guardrails have become a necessity today. Road safety and security are of utmost importance and the metal crash barriers help in aiding it by absorbing the impact energy during accidents. It acts as an additional infrastructural support. It consists of W-beam, Post/spacer, end section and fasteners. Thus, hot dip galvanization for the W-beam, Post/spacer and fasteners are extremely important for safety as well as security. Both the W-beam and Post’s channel section use hot rolled sheets, 3mm 2.67mm thick and 5mm thick respectively. Both are hot dip galvanised according to the standards set by the regulating authority. In case of the fasteners the bolts, nuts and washers hot dip galvanization is required and most importantly this needs to be done in accordance to IS 1364 and IS 1367 of grade 4.6 MS.

The hot dip galvanizing services are also available for cable trays. These cable trays are used to give support to the electrical cables that are insulated and utilised in distributing power, communication and control in the electrical wiring of a building. Hot dip galvanizing is necessary in this regard as corrosion of these can lead to catastrophic results which clearly proves how important it is for the prevention of any kinds of disastrous results or outcomes.  Also, it aids in making it longer lasting and durable.

Similarly, for earthing strips, the services of hot dip galvanization. Earthing is conducted to connect the metallic parts of electric machines and equipment to the earth plate or earth electrode with use of thick wire that is conductive. Earthing is done to avert dangers due to discharge of electric energy.  Providing hot-dip galvanization for these strips helps ensure appropriate effective efficient and safety in the working of the machines of the industry.

It is extremely important to follow the proper practices of preparation of metal before galvanization is done. The metal is cleaned to remove all contaminants using caustic chemicals and then rinsed followed by further treatment through pickling.

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The galvanization of steel is a process in which a protective layer of zinc is applied to the steel to make it more durable. One of the popular methods of this galvanizing is hot dip galvanizing, where the steel is dipped into a hot molten zinc. This process has been used for years to protect steel from corrosion and there are many companies who offer hot dip galvanizing services.

However, these hot dip galvanizing services have emerged into the more advanced duplex system. This is basically the way of powder coating the steel after hot dip galvanization. The moment paint and galvanized steel are infused together, the corrosion control becomes stronger thereby protecting the base steel by providing a barrier along with a cathodic protection. Moreover, galvanization prevents the development of iron-oxide, preventing the paint to blister and peel off faster. The paint also slows down the rate of zinc damage.

Characteristics of Coating

It’s important to know the characteristics of steel after galvanizing. It starts to react the moment it’s out of the molten zinc. So, it depends on the environment. Based on this situation galvanized steel is divided into three parts. Newly galvanized, partially weathered and fully weathered. Each of this requires duplex coating, but slightly different from the other, because of the surface material and different characteristics of galvanized steel.

Preparing Hot Dip Galvanized Steel for Powder Coating

The preparation of the hot dip galvanized steel for powder coating or painting involves two steps which are as follows.

Cleaning: The cleaning is done to remove the dirt from the surface. However, it’s important to do this task carefully, because highly acidic or even basic cleaning sometimes scrapes off the zinc from the surface. There are a few types of cleaning methods, like

• Ammonia cleaning -This is used to clean the parts with ash residue that are left behind because of galvanizing.
• Alkaline cleaning – Oil, grease and dirt can be removed with this alkaline solution cleaning.
• Solvent cleaning – Cleans all the volatile compounds.

Profiling: To provide a good adhesion to for the paint, it requires the galvanized steel surface to be slightly roughened or ridged.

These two things are to be done perfectly, only then the powder-coat or the paint will stick to the steel. There are 4 types of the profiling method-

• Abrasive sweep or brush blast – To roughen the galvanized surface this method is used.
• Acrylic passivation – This method is used to passivate the galvanized surface.
• Conversion coating – Enhances the durability and adherence of the paint.
• Paint formulations – This is an alkyd formulation used as the paint.

The galvanizing of steel is an advanced way to make the steel durable and strong. With the advanced method of powder coating or painting, this process has become more advantageous for a long-lasting use.

The continuous change in the atmospheric condition has given a steep rise to the corrosive action of nature. In such a calamity humans have created galvanized structure to fight the corrosion against their creation. In spite of the effort to keep their creation safe by process of galvanization success is not always fruitful. The main reason for such failure can be summarized under the poor quality of the galvanized structure. To ensure safety and long lasting galvanized structures it is important a thorough inspection is done on the creation. To achieve such durability in a hot dip galvanized structure an inspecting team must keep in mind the following layouts:

1. Appearance

• Cooling rate: To ensure a durable hot dip galvanized structure, the cooling rate of the product must be above 550F with compression and metallurgical reaction between Iron and Zinc in the solid state. This will ensure uniformity in the colour.

• Steel Processing: The usage of steel in process of fabrication ensures appearance to be both dull and bright, further inter-metallic formation is created due stresses exerted on the steel during the process. This ensures the protection against corrosive agent stays intact making the structure durable.

2. Surface and Condition:

• Bare Spots: This generally takes places due to welding slag and rusting on the surface. To avoid bare spot one must ensure the surface area was properly cleaned before the process of galvanization after pre-treatment. In case of high amount bare spots the entire length of the subject must be stripped and re-galvanized.

• Chain and Wire Marks: During process of transportation chain and wire marks does takes place on the structure. If this results in exposing of the base steel structure, it is important to re-galvanize the area of the structure for better lasting.

• Clogged holes and Threads: The clogged holes are effect of viscous zinc packed in holes below 3mm. This can be avoided by making the holes larger in size, and if 3mm requirement holes clogged by zinc are utility then they must be centrifuge above 500 Fahrenheit. Similarly in case of clogged thread that is the effect of poor drainage, the same principle is to be applied.

3. De-lamination and Peeling: This is usually a coating of Iron and Zinc above the galvanized steel structure that creates a gap between the two layers; it takes places because structures takes a long time to cool down even after brought out from the galvanizing kettle. If peeling the coat meets the required specification of galvanization can be used for further structural demonstration or can be re-galvanized as per requirement. De-lamination usually due to effect of blasting is not the responsibility of the galvanizer.

4. Excess Aluminium in Bath: In case of the process of galvanization Zinc is the major liquid with 98% the rest 2% used is majorly Aluminium – “discretion of galvanizer” as such it creates black mark on the structure. If the spots are visible and small it can be removed. However for huge load the structure must be re-galvanized.

Related: Hot Dip Galvanizing Process | Tanya Galvanizers

These major points during the process of inspection if taken care of, will create a strong galvanized structure for utility purposes.

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The continuous change in the world’s environment has created a steady rise in the process of corrosion against almost every man made structure across the globe. In such a scenario galvanized structures. i.e. “steel and other materials” are the best resolution to fight against corrosion and other corrosive agents.

In most scenarios’ hot dip of galvanized steel structures are done after the process of fabrication. However, in order to allocate a successful hot dip on fabricated steel structure the organizations providing hot dip galvanized services should take into consideration the following major factors:

• In order to properly complete hot dip galvanization organization must avoid narrows gap between the plates that has been laid for the process.
• One should also take a close look that no surfaces are overlapped during the process of hot dip galvanization.
• Taking proper measures to ensure that no overlapping took place in case of angles when placed back to back and even in case of the channels.
• While hot dipping fabricated steel it is important to ensure that the gap between the contacting surface and structure should not be more than 2.4mm. This will allow cleaning solution to enter the structure but the entry of zinc can be completely avoided as zinc is harmful for the steel structure during the process of hot dip galvanization.
• To attain a successful hot dip galvanization process for steel structure it is important that all the welding, are completely sealed and even a opening for a pin is not left over to ensure that no explosion takes places during the process, as trapped air in the structure can give rise to explosion during the process of galvanization.

These important points should always be taken care of while hot dipping a fabricated structure for the process of galvanization. Further, it is suggestible to create sub-assemblies and assemblies for progressive dip because this would allow the structure to be submerge in a single go creating a uniform expansion and contraction.

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These days, there have emerged numerous companies that has been offering top quality hot dip galvanizing services at affordable rates to its clients. One should not compromise on the quality aspect for price. But before trying to avail such services, it will be first necessary to have a clear understanding why galvanizing is considered to be important and required in the first place. Only then can the best services be availed that can prove to be useful and worth the investment made.

About Galvanization

It is considered to be a process to apply protective zinc coating over metals like iron or steel for avoiding premature corrosion and rust. Galvanized steel’s proponents are known to us this method for repairing or to construct steel structures. For instance, they can benefit immensely from lower repair and maintenance costs associated with it due to its special properties.

Need for protection

Without provide adequate protection, it is quite natural for steel to rust quickly because of atmospheric conditions that it faces with time. Again, the degree of rust is likely to depend upon the environment in which the product is present. Rust is regarded to be iron oxide (which is typically red oxide). It is formed with the oxidation and reduction reaction of oxygen and iron, with the presence of air moisture or water.

Although there are present several protective methods to be followed like plastic coating or painting, these methods tend to have their own drawbacks. If damaged, the steel sections are likely to become rusty, thus causing the protective coating to fall away, thereby making such protection types to be unreliable and non-lasting (always require continued maintenance).

Why use hot dip galvanizing of earthing materials?

Hot dip galvanization according to the industry experts is considered to be a wonderful and time proven method to protect steel materials. All material surfaces with this type are dipped into and then coated with molten zinc completely.

Zinc is said to face slow corrosion, thus providing it with extended life as it safeguards the base metal. With zinc being alloyed to iron, there occurs cathodic protection. It does ensure that the smaller steel areas which are exposed due to damaged do not get compromised by rust. The small damaged areas unlike that of organic coatings do not require touch up. Cathodic protection is sure to last for a long time until there is present zinc layer.

Special care is to be taken if the project needs contact between brass or copper and any galvanized material. It is deemed so in humid or moist environment, since there occurs rapid corrosion of zinc. Water running from brass or copper surface may have sufficient dissolved copper within, thus causing corrosion quickly. In case, it applies to the specific situation, then it can be prevented by ensuring flow of water to copper or brass parts from galvanized materials.

Benefits of galvanizing of sub station structures

There are several benefits to be gained through galvanizing, some of which are given below:

• Low long term cost and less maintenance
• Lower cost when compared to stainless
• Longer life expectancy
• Coating performance and longevity reliable
• Protection offered to smaller steel areas exposed due to damage
• Outstanding resistance offered to mechanical damage
• Zero lost time with surface inspection, preparation and painting
• Other types of coating will not offer similar protection

Read more: Sub-Station Structures

Keeping the above benefits in mind, galvanizing is indeed worth the try and effort and a great investment.

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